JP6082631B2 - Fire pump car - Google Patents

Description

  The present invention relates to a fire fighting pump vehicle, and more particularly, to a fire fighting pump vehicle equipped with an air compressor together with a pump and having a feature in the arrangement structure of the air compressor.

  As an example of a fire pump vehicle equipped with a water discharge pump and an air compressor, there is a fire pump vehicle employing a CAFS (Compressed Air Foam System) (see Patent Documents 1 and 2).

  In this CAFS, instead of the conventional water discharge method in which the water pressurized by the pump is discharged as it is, compressed air is injected into the mixed liquid of high-pressure water and a fire extinguishing agent and foamed using an air compressor. In this method, fire is extinguished by injecting water (bubbles), and in this method, the surface area of water is increased by injecting highly foamed water, and efficient cooling and extinguishing is performed using the heat of vaporization. In addition, it is possible to extinguish with less water, and it is possible to perform effective fire extinguishing activities even in places with poor water use or under water shortage during disasters.

  Although the configuration of the air compressor used in the fire pump car is not disclosed, an air compressor in which the compressor main body is placed on the receiver tank and the both are integrated as a unit has also been proposed ( (See Patent Document 3).

JP 2010-220686 A Japanese Patent No. 4919919 Japanese Patent Publication No. 7-30748

  As mentioned above, by adopting CAFS that foams water and discharges water in the form of bubbles, it is possible to perform efficient fire fighting activities with less water, but such fire fighting activities are possible In order to achieve this, it is necessary to install an air compressor for generating compressed air in addition to conventional pumps and water tanks in the body of the fire pump car. It is necessary to secure a space for accommodating the air compressor in the space created.

  Fire pump trucks generally employ a configuration in which the pump is driven by the rotational driving force of the engine provided for traveling. Therefore, the pump housed in the housing space in the body has its drive shaft connected to the engine. It is connected to an output shaft, for example a PTO (Power Take Off) shaft.

  In such a fire pump car, for example, when the air compressor described in Patent Document 3 in which the compressor body is integrally formed with the receiver tank is unitized, the air compressor is mounted on the body frame. By assembling each component in advance and completing the piping to complete the air compressor unit before mounting, the unit can be mounted on the body frame as a unit so that the air compressor can be installed once. There is an advantage that the installation can be completed.

  However, when the air compressor described in Patent Document 3 is mounted on a fire pump car, if it tries to avoid interference with other equipment such as a pump, a drive shaft, and a water tank, If a large dead space is created in the interior space and no dead space is created, the storage space for other equipment such as a water tank is reduced.

  On the other hand, the fire pump car is also a “vehicle” for self-running and traveling to the fire site, so it is also required for stability and safety during driving, and how it reduces the occurrence of dead space. Even if the arrangement can be adjusted, for example, the distribution of weights on the left and right of the vehicle may be greatly biased, or the vehicle may be placed in a way that impairs stability and safety during driving, such as increasing the center of gravity of the vehicle. It cannot be adopted.

  As described above, in the configuration of the air compressor described in Patent Document 3, the heavy duty compressor main body is placed on the receiver tank. When mounted on a pump truck, the center of gravity of the fire pump truck will be high regardless of where it is placed, and the body frame avoids the drive shaft of the pump located at the center in the width direction of the fire pump truck. When placed on top, the vehicle weight distribution in the width direction will be greatly biased, and the stability and safety during running will be significantly reduced.

  In this way, when the dead space generated in the housing space in the body is made as small as possible, and the weight distribution in the width direction of the fire pump car is made uniform and a low center of gravity is to be realized, an air compressor is used. After disassembling the components such as the compressor body, receiver tank, separator, air filter, oil cooler, etc., and arranging the components and pumps and water tanks so that the weight distribution is uniform and the low center of gravity is achieved. It is also possible to arrange it in a surplus space and attach it to the body frame or body as appropriate.

  However, if the air compressor is disassembled for each component and attached to the body frame or body in this way, brackets for attaching each part are provided on the body frame and body of the fire pump car, Mounting work such as mounting components one by one on this bracket is required.

  In addition, since it is necessary to connect each part with piping etc. so that each part after installation can function as an air compressor as a whole, when such an installation method is adopted, a fire pump The time and cost required for assembling the vehicle are greatly increased.

  Moreover, since there are many parts that make up the air compressor that require regular cleaning and replacement work, such as air filters, oil filters, and separators, they are caught only in terms of weight distribution and low center of gravity. If these parts are placed in a concealed place where they cannot be reached, maintenance work will be greatly reduced, such as the need to remove the surrounding parts when cleaning or replacing the parts.

  Therefore, the present invention has been made to eliminate the above-mentioned drawbacks of the prior art, and is accommodated in the space inside the body while making the dead space as small as possible in the space inside the body of the fire pump car. An object is to provide an arrangement structure of an air compressor in a fire-fighting pump vehicle that is easy to assemble and that is excellent in convenience of maintenance, inspection, etc. while optimizing the weight balance of components.

  Hereinafter, means for solving the problem will be described together with reference numerals used in the embodiment for carrying out the invention. This code is used to clarify the correspondence between the description of the scope of claims and the description of the mode for carrying out the invention. Needless to say, this code is limited to the interpretation of the technical scope of the present invention. Not used.

In order to achieve the above object, the fire pump vehicle 1 of the present invention is a tilt cab type in which a cab 3 covering an engine (not shown) mounted on the front side of a vehicle body frame 2 is configured to be tiltable forward of the vehicle. Configured as a vehicle,
A pump 7 and an air compressor 5 are housed in a housing space 41 formed in a body 4 provided behind the cab 3.
The pump 7 is provided with a drive shaft 72 extending from the pump body 71 through the substantial center in the width direction of the body frame toward the cab 3, and the drive shaft 72 is connected to the engine output shaft (PTO shaft 6). )
The air compressor 5 is provided with a basic unit 5 ′ integrated with a compressor body 52 attached to the side of the receiver tank 51, and the receiver tank 51 of the basic unit 5 ′ is connected to the drive shaft 72 of the pump 7. The air compressor 5 is placed on the one side in the width direction of the vehicle body frame 2 divided into left and right by the above and the air compressor 5 is placed in a state where the compressor main body 52 is disposed above the drive shaft 72. While accommodated in the accommodation space 41 at a position near the cab 3 with respect to the main body 71,
The drive shaft 72 and the input shaft 53 of the compressor body 52 are connected via a power transmission means 8 (Claim 1).

  In the fire pump vehicle having the above-described configuration, the basic unit 5 ′ is formed by fixing the compressor body 52 to the side surface of the receiver tank 51 (Claim 2).

  Further, a bracket that is erected on the vehicle body frame 2 on the side opposite to the receiver tank 51 across the drive shaft 72 in addition to the receiver tank 51 and the compressor body 52 in the basic unit 5 ′. 59, and the compressor main body 52 is erected between the receiver tank 51 and the bracket 59 so as to be integrated (Claim 3).

  The separator 54, the oil filter 55, and the air filter 56 provided in the air compressor 5 are detachably disposed from the cab 3 side (Claim 4).

  The compressor body 52 is arranged so that the input shaft 53 protrudes toward the cab 3 side, and the power transmission means 8 is provided with a drive pulley 81 provided on the drive shaft 72, the compressor body. 52, a driven pulley 82 provided on an input shaft 53, and a pulley belt 83 stretched between the driving pulley 81 and the driven pulley 82.

  In this case, the power transmission means 8 is further provided with a tension pulley 84 for adjusting the tension of the pulley belt 83 between the drive pulley 81 and the driven pulley 82 (Claim 6).

  In the fire pump vehicle 1 of the present invention described above, the following remarkable effects could be obtained.

  The air compressor 5 is provided with a basic unit 5 ′ that is integrated by attaching a compressor main body 52 to the side surface of the receiver tank 51, and has a substantially inverted L shape (see the broken line in FIG. 3). The 5 ′ receiver tank 51 is placed on one side in the width direction of the vehicle body frame 2 divided into left and right by the drive shaft 72 of the pump 7 and fixed, and the compressor main body 52 is placed above the drive shaft 72. Since the air compressor 5 is disposed, the air compressor 5 can be efficiently disposed and accommodated in the space around the drive shaft 72 that tends to be a dead space.

  In addition, since the compressor main body 52 and the receiver tank 51, which are main components of the air compressor 5, are integrated into the basic unit 5 ', the receiver tank 51 and the compressor main body are mounted before mounting on the body frame 2. 52 is completed as the basic unit 5 ′, and other components such as an air filter 56, an oil filter 55, a separator 54, and an oil cooler 57 are assembled in advance to the basic unit 5 ′ as necessary. The air compressor 5 is completed in a unitized state, and the basic unit 5 ′ or the air compressor 5 assembled in advance in this way is attached to the body frame 2, so that the air compressor 5 is attached to the body frame 2 once. Thus, the mounting operation of the basic unit 5 ′ or the entire air compressor 5 was completed.

  In the configuration in which the compressor main body 52 is fixed to the side surface of the receiver tank 51 to form an integral basic unit 5 ′, the receiver tank 51 can be used as a bracket for supporting the compressor main body. .

  The compressor main body 52, which is a component of the air compressor 5, is disposed above the drive shaft 72 and on the side of the receiver tank 51, so that the relatively heavy compressor main body 52 is attached to the body frame 2. As compared with the case where the compressor main body 52 is placed on the receiver tank 51, the fire pump car 1 can be disposed at the center in the width direction. The vehicle was well balanced and had a low center of gravity.

  Furthermore, from the arrangement of the air compressor 5 described above, a large space can appear in front of the air compressor 5 by tilting the cab 3 as shown by a broken line in FIG. Thus, maintenance and inspection work of the air compressor 5 could be easily performed by entering an operator.

  In addition to the receiver tank 51 and the compressor body 52, the basic unit 5 'is further erected on the body frame 2 on the opposite side in the width direction from the receiver tank 51 with the drive shaft 72 interposed therebetween. A bracket 59 (see the broken line in FIG. 2) as a whole constructed by laying the compressor main body 52 between the receiver tank 51 and the bracket 59. In addition to being able to stably attach the relatively heavy compressor main body 52, the bracket 59 is used to attach the air filter 56, the oil cooler 57, etc., which are other components of the air compressor 5. It could also be used as a bracket.

  Further, parts such as the separator 54, the oil filter 55, and the air filter 56 provided in the air compressor 5 are detachably arranged from the cab 3 side, so that these parts are interposed through the space generated by the tilt of the cab 3. Could be easily cleaned and replaced.

  Further, the compressor main body 52 is arranged so that the input shaft 53 protrudes toward the cab 3 side, and the power transmission means 8 is provided with a drive pulley 81 provided on the drive shaft 72, the compressor main body. 52, the driven pulley 82 provided on the input shaft 53, and the pulley belt 83 stretched between the driving pulley 81 and the driven pulley 82, so that the driving pulley 81, the driven pulley 82, and the pulley belt 83 are As described above, the tension adjustment and replacement work of the pulley belt 83 can be easily performed through the space generated when the cab 3 is tilted as described above.

  In the configuration in which a tension pulley 84 that adjusts the tension of the pulley belt 83 between the driving pulley 81 and the driven pulley 82 is further provided as the power transmission means 8, the tension of the pulley belt 83 is adjusted by adjusting the tension pulley 84. The mechanism for raising and lowering the compressor main body 52 as in the case of adjusting the tension of the pulley belt 83 by adjusting the distance between the driving pulley 81 and the driven pulley 82, and such raising and lowering can be performed. It is not necessary to provide a space for enabling in the accommodation space 41, and the accommodation space 41 in the body 4 can be used more efficiently.

The side see-through | perspective view of the fire fighting pump vehicle of this invention. The A arrow directional view of FIG. FIG. 3 is a view as seen from the direction of arrow A in FIG. 1 (modified example of FIG. 2). FIG. 3 is a view taken along the arrow A in FIG. 1 (another modification example of FIG. 2). The top view of the air compressor shown in FIG.

  Next, embodiments of the present invention will be described with reference to the accompanying drawings.

  In FIG. 1, reference numeral 1 is a fire pump car of the present invention. This fire pump car includes a traveling engine (not shown) mounted on the front side of the vehicle body frame 2 and a cab 3 that is a room for passengers to ride so as to cover the upper part of the engine. The cab 3 is configured as a so-called “tilt cab type” vehicle that can tilt in a counterclockwise direction as indicated by a broken line in FIG.

  The body frame 2 on the rear side of the cab 3 is covered with a body 4. A housing space 41 is formed in the body 4, and the pump 7 and the air compressor 5 are placed in the housing space 41. , Equipment necessary for water discharge such as a water tank (not shown) is accommodated, and the function as the fire pump vehicle 1 is given to the tilt cab type base vehicle by mounting these devices.

  These devices housed in the housing space 41 may be directly mounted on the main frame 21 constituting the main body portion of the body frame 2, but in the present embodiment, further on the main frame 21, The sub-frame 22 for mounting the pump 7, the air compressor 5, and the water tank (not shown) is attached, and these components can be mounted on the sub-frame 22.

  Among these components, the above-described pump 7 is mounted and fixed on the vehicle body frame 2 with a body portion 71 at a predetermined distance d with respect to the rear end of the cab 3 as shown in FIG. In the fire pump vehicle of the present invention, the air compressor 5 described later can be accommodated in the distance d between the pump body 71 and the cab 3.

  The pump 7 is provided with a drive shaft 72 for inputting rotational drive force. As shown in FIGS. 1 and 2, the drive shaft 72 passes through the center of the vehicle body frame 2 in the width direction, and the front side of the vehicle. A pump 7 is mounted on the vehicle body frame 2 so as to extend toward the front.

  Thus, the drive shaft 72 of the pump 7 arranged in the accommodation space 41 has an output shaft extending from the engine (not shown) provided in the lower part of the cab 3 toward the accommodation space 41, In the example, a PTO (Power Take Off) shaft 6 is connected, and the output of the engine can be input to the pump body 71 via the PTO shaft 6 and the drive shaft 72.

  Thus, the drive shaft 72 of the pump 7 is straddled in the accommodation space 41 located on the side of the cab 3 with respect to the pump main body 71 accommodated in the accommodation space 41 (part of the distance d in FIG. 1). The air compressor 5 is housed in the space 41 around the drive shaft 72, and the weight balance on the vehicle body frame 2 is optimized. The low center of gravity can be realized.

  The air compressor 5 includes at least a receiver tank 51 and a basic unit 5 ′ integrally formed by attaching a compressor body 52 to the side of the receiver tank 51, and compressed air discharged from the receiver tank 51. An oil provided in an oil supply circuit for supplying the compressor body 52 with lubricating oil recovered by a separator 54 for removing oil contained therein, an air filter 56 provided in an intake passage of the compressor body 52, and a receiver tank 51. Necessary parts such as a filter 55 and an oil cooler 57 are provided.

  In the configuration example shown in FIG. 2, the basic unit 5 ′ includes a compressor body 52 that is an oil-cooled screw compressor, and a receiver tank that introduces compressed air discharged together with lubricating oil from the compressor body 52. In addition to 51, a bracket 59 standing upright with respect to the receiver tank 51 at a predetermined interval is provided, and the compressor main body 52 is erected between the receiver tank 51 and the bracket 59 so as to be integrated. The formed gate-shaped basic unit 5 ′ (see the broken line in FIG. 2) is formed as a whole.

  The receiver tank 51 among the components of the basic unit 5 ′ is a pressure vessel formed into a substantially cylindrical shape by covering the upper and lower ends of a cylindrical body formed of a steel pipe or the like, or a pressure vessel cast into a substantially cylindrical shape. The receiver tank 51 is placed and fixed on the sub-frame 22 on one side in the width direction of the vehicle body frame 2 divided into the left and right by the drive shaft 72 of the pump 7 so that its axis is in the vertical direction. ing.

  A mounting seat for fixing the compressor main body 52 is formed at a portion near the upper end of the side wall (side surface portion) of the receiver tank 51, and the compressor main body 52 is fixed and attached to the mounting seat. 51, by attaching the compressor main body 52 also to the side surface near the upper end of the bracket 59 disposed at an interval corresponding to the width of the compressor main body 52, the receiver tank 51, the compressor main body 52, and The bracket 59 is arranged in a substantially gate shape (see the broken line in FIG. 2) as a whole to constitute an integrated basic unit 5 ′.

  Then, the lower end portion of the receiver tank 51 constituting the gate-shaped basic unit 5 ′ is placed on one side in the width direction of the vehicle body frame 2 divided into left and right by the drive shaft 72 of the pump 7. The compressor body 52 is driven while avoiding interference between the receiver tank 51 and the drive shaft 72 by mounting and fixing the lower end portion of the bracket 59 on the other side in the width direction of the body frame 2. The input shaft 53 can be arranged above the shaft 72 so as to protrude toward the front (cab 3 side).

  As described above, the receiver tank 51, the compressor main body 52, and the bracket 59 are integrated to form the basic unit 5 ', so that the receiver tank 51, the compressor main body 52, and the bracket 59 are installed before being mounted on the vehicle body frame 2. The above-mentioned basic unit 5 ′ is completed in advance, and parts such as a separator 54, an air filter 56, an oil filter 55, and an oil cooler 57 are further attached to the basic unit 5 ′ as necessary. By doing so, it is possible to complete the mounting operation of the basic unit 5 ′ or the entire air compressor 5 with a single mounting operation to the body frame 2.

  In the embodiment shown in FIG. 2, not only the basic unit 5 ′ is used as a support member for the compressor main body 52, but also other devices constituting the air compressor 52 such as an air filter 56 and an oil cooler 57 are attached. It is used as a stay.

  In the example shown in FIG. 2, the bracket 59 is formed in a substantially U-shape as a whole in which projecting portions 59 b and 59 c projecting in the horizontal direction from the upper and lower ends of the bracket body 59 a forming the height direction are formed. A projection 59c on the lower end side of the bracket 59 is placed and fixed on the subframe 22, and an air filter 56 is placed and fixed on the projection 59b on the upper end side, and the bracket 59 between the upper and lower projections 59b and 59c is fixed. An oil cooler 57 that cools the lubricating oil by heat exchange with fire-extinguishing water is attached to the main body portion 59a of the main body 59a, and an oil filter 55 is attached above the compressor main body 52.

  The bracket 59 is not necessarily provided, and as an example, as shown in FIG. 3, the compressor body 52 has a cantilever structure that is fixed only to a mounting seat provided in the receiver tank 51. The main unit 52 forms an integral basic unit 5 ′ (see the broken line in FIG. 3) having a substantially inverted L shape, and the lower end of the receiver tank 51 constituting the basic unit 5 ′ is driven by the pump 7. The compressor body 52 may be disposed above the drive shaft 72 by being mounted and fixed on one side in the width direction of the vehicle body frame 2 divided into left and right by the shaft 72.

  As described above, when the compressor main body 52 has a cantilever structure in which only the receiver tank 51 is fixed, the above-described air filter 56 is attached to the compressor main body 52 or the oil filter 55 mounted and fixed on the compressor main body 52. It may be fixed.

  2 and 3, the basic unit 5 ′ in which the compressor main body 52 is directly fixed to the mounting seat formed on the side surface of the receiver tank 51 has been described. However, the basic unit 5 ′ of the present invention has this structure. Without being limited thereto, a bracket or stay for integrating the receiver tank 51 and the compressor main body 52 is provided, and the compressor main body 52 is disposed and attached to the side of the receiver tank 51 via the bracket or stay. The basic unit 5 ′ may be used.

  As described above, the input shaft 53 of the compressor main body 52 disposed above the drive shaft 72 is connected to the drive shaft 72 of the pump 7 through the power transmission means 8, and the output of the engine (not shown) is output. When input to the drive shaft 72 via the PTO shaft 6, the input shaft 53 of the compressor main body 52 is also rotated to start air compression.

  As the power transmission means 8, various known power transmission means such as a pulley and a pulley belt, a sprocket and a chain, and a gear mechanism can be employed. In this embodiment, the power transmission means is shown in FIGS. As described above, the drive pulley 81 attached to the drive shaft 72 of the pump 7, the driven pulley 82 attached to the input shaft 53 of the compressor body 52, and the pulley belt 83 spanned between the drive pulley 81 and the driven pulley 82. The power transmission means 8 described above is configured.

  In the example shown in FIGS. 2 and 3, the tension of the pulley belt 83 is adjusted by adjusting the distance between the driving pulley 81 and the driven pulley 82. As shown, a tension pulley for adjusting the tension of the pulley belt 83 may be provided between the driving pulley 81 and the driven pulley 82. With this configuration, the tension of the pulley belt 83 can be adjusted more easily. Therefore, the entire space in the accommodation space 41 can be used more effectively.

  That is, as shown in FIGS. 2 and 3, when adjusting the tension by changing the distance between the driving pulley 81 and the driven pulley 82, for example, the mounting position of the compressor body 52 needs to be formed so as to be movable in the vertical direction. Yes, it is necessary to secure a space to enable the movement of the compressor body.

  On the other hand, in the configuration in which the tension pulley 84 for adjusting the tension of the pulley belt 83 is provided as shown in FIG. 4, the distance between the driving pulley 81 and the driven pulley 82 is kept constant. Since the tension can be adjusted 83, it is not necessary to provide a space for allowing the compressor body 52 to move up and down, and it is not necessary to provide an extra space in the accommodation space 41.

  The compressor body 52 is fixed to a mounting seat provided in the receiver tank 51 in such a direction that the input shaft 53 protrudes forward (cab 3 side). , And the pulley belt 83 are arranged at positions close to the cab 3, and other components of the air compressor such as the air filter 56, the oil filter 55, the separator 54, and the oil cooler 57 are also connected to the cab 3. The cab 3 is tilted so that it can be removed from the side, and the rear end of the cab 3 that has blocked the front of the air compressor 5 is flipped up so that it is relatively in front of the air compressor 5. A wide work space appears, and work such as inspection of the air compressor 5 can be easily performed through this space.

  In particular, as described above, the pulley belt 83, the air filter 56, the oil filter 55, the separator 54, and the like that constitute the power transmission means 8 are arranged on the cab 3 side, such as parts that need to be periodically cleaned or replaced. Therefore, maintenance, inspection, cleaning, and replacement work are extremely easy.

  In the embodiment shown as an example, in order to facilitate the inspection and replacement of such parts, the separator 54 is connected to the cab 3 side as shown by a two-dot chain line in FIG. The filter element 56b of the air filter 56 and the oil filter 55 are detachably mounted toward the cab 3 as shown by a two-dot chain line in FIG. ing.

DESCRIPTION OF SYMBOLS 1 Fire pump car 2 Body frame 21 Main frame 22 Sub frame 3 Cab 4 Body 41 Housing space 5 Air compressor 5 'basic unit 51 Receiver tank 52 Compressor body 53 Input shaft 54 Separator 55 Oil filter 56 Air filter 56a Casing (Air Of filter)
56b Filter element (for air filter)
57 Oil cooler 59 Bracket 59a Main body 59b, 59c Projection 6 PTO shaft 7 Pump 71 Pump body 72 Drive shaft 8 Power transmission means 81 Drive pulley 82 Driven pulley 83 Pulley belt 84 Tension pulley

Claims (6)

The cab that covers the engine mounted on the front side of the body frame is configured as a tilt cab type vehicle that is configured to be tiltable forward of the vehicle.
A pump and an air compressor are housed in a housing space formed in the body provided behind the cab,
The pump is provided with a drive shaft extending from the pump body through the approximate center in the width direction of the vehicle body frame toward the cab, and the drive shaft is connected to the output shaft of the engine,
The air compressor is provided with a basic unit integrated with a compressor body attached to the side of the receiver tank, and the receiver tank of the unit is divided in the width direction of the vehicle body frame divided into left and right by the drive shaft of the pump The air compressor is housed in the housing space at a position close to the cab with respect to the pump body in a state where the compressor body is disposed above the drive shaft. Along with
A fire pump vehicle characterized in that the drive shaft and the input shaft of the compressor body are connected via a power transmission means.   The fire pump car according to claim 1, wherein the basic unit is formed by fixing the compressor body to a side surface of the receiver tank.   In addition to the receiver tank and the compressor main body, the basic unit is provided with a bracket erected on the body frame on the opposite side to the receiver tank across the drive shaft, and the receiver tank The fire pump vehicle according to claim 1 or 2, wherein the compressor main body is installed and integrated between the brackets.   The fire pump vehicle according to any one of claims 1 to 3, wherein a separator, an oil filter, and an air filter provided in the air compressor are detachably disposed from the cab side.   The compressor body is arranged so that its input shaft protrudes toward the cab side, and the power transmission means includes a drive pulley provided on the drive shaft, and a driven follower provided on the input shaft of the compressor body. The fire pump car according to any one of claims 1 to 4, comprising a pulley and a pulley belt stretched between the driving pulley and the driven pulley.   The fire pump vehicle according to claim 5, wherein the power transmission means further includes a tension pulley for adjusting a tension of the pulley belt between the driving pulley and the driven pulley.

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